Should I get genetic testing for breast cancer?
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Only 5% to 10% of breast cancers result from an inherited genetic mutation. But when mutations are present — most commonly in the BRCA1 and BRCA2 genes — a woman's risk for breast cancer can increase by as much as 80%. If you have a family history of breast cancer (mother, sister, grandmother or aunt), you’re a candidate for genetic testing, especially if your family member was diagnosed at 50 or younger. (Note that the person diagnosed should be tested first, as their results will likely mirror yours.)
Other factors women should consider include whether they've had any previous bouts with breast or ovarian cancer, a family history of male breast cancer or BRCA1 or BRCA2 gene mutations.
Rest assured, family history doesn't mean you'll definitely develop breast cancer. Similarly, the absence of family history doesn't mean you won't get it. Talk to your doctor about your concerns and see a genetic counselor to learn your options and the benefits and risks of testing.
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Copyright © 2025 by Harvard University. Original work prepared by Harvard Health Publishing in English.
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